sfcc-backend

SFRA backend controllers use module.superModule to extend base cartridge functionality and next() to pass execution down the middleware chain. Proper flow control ensures cross-cartridge requires and route modifications execute predictably without breaking base storefront behavior.

SFCC cartridge layering structures customizations by stacking cartridges so overlays override base SFRA templates and models. This approach isolates site-specific logic while maintaining core server patterns, preventing direct modifications to base cartridges during deployment.

Unit testing SFCC backend cartridges with Mocha and proxyquire involves mocking the dw.* SFCC API dependencies to isolate server-side code. This strategy validates controllers and models locally without requiring a live Commerce Cloud instance for every test execution.

Yes, server.append and server.replace modify existing SFRA routes within custom cartridges to extend or override middleware. This ensures base cartridge code remains untouched, allowing safe upgrades while applying project-specific server patterns and route guardrails.

Cross-cartridge requires in SFCC backend development often fail when cartridge paths are misconfigured or circular dependencies exist. Following strict cartridge layering conventions and using module.superModule prevents broken requires and maintains stable deployment packaging.